package org.learn.intermediate.smallchange;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
//1、输出菜单
//2、完成零钱通明细
//3、完成收益入账
//4、完成消费
//5、完成改进，询问用户是否确定退出，y/n
//6、校验money 的范围，尽量找不正确的条件；编程思想；

public class SmallChangeSys {
    public static void main(String[] args) {

        boolean loop = true;
        Scanner scanner = new Scanner(System.in);
        String key = "";

        //2、完成零钱通明细
        String details = "------------零钱通明细------------";

        //3、完成收益入账，定义新的变量
        double money = 0;
        double balance = 0;
        Date date = null;
        SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd HH:mm");//用于日期格式化


        //4.消费，新变量
        String note = "";
        do {
            System.out.println("\n======零钱通菜单======");
            System.out.println("\t\t\t1.零钱通明细");
            System.out.println("\t\t\t2.收益入账");
            System.out.println("\t\t\t3，消费");
            System.out.println("\t\t\t4.退    出");

            System.out.println("请选择(1-4)");
            key = scanner.next();

            //使用switch 分支控制
            switch (key) {
                case "1":
                    System.out.println(details);
                    break;
                case "2":
                    System.out.println("2.收益入账金额：");
                    money = scanner.nextDouble();
                    //校验
                    if (money <= 0) {
                        System.out.println("收益入账金额需要>0");
                        break;
                    }
                    balance += money;
                    //拼接当前信息到details
                    date = new Date();
                    details += "\n收益入账\t" + money + "\t" + sdf.format(date) + "\t" + balance;
                    break;
                case "3":
                    System.out.println("消费金额:");
                    money = scanner.nextDouble();
                    if (money <= 0 || money > balance) {
                        System.out.println("你的消费金额应该在0-" + balance);
                        break;
                    }
                    System.out.println("消费说明：");
                    note = scanner.next();


                    balance -= money;
                    date = new Date();
                    details += "\n" + note + "\t-" + money + "\t" + sdf.format(date) + "\t" + balance;
                    break;
                case "4":
                    //使用while break
                    //退出while 后判断是否真的退出

                    String choice = "";
                    while (true) {
                        System.out.println("你确定要退出吗？y/n");
                        choice = scanner.next();
                        if ("y".equals(choice) || "n".equals(choice)) {
                            break;
                        }
                    }
                    //退出while后
                    if (choice.equals("y")) {
                        loop = false;
                        System.out.println("4.退     出");
                    }
                    break;

                default:
                    System.out.println("输入有误，请重新选择");

            }
        } while (loop);
        System.out.println("---------退出了零钱通-------");
    }
}
